William Wallace Blair (October 11, 1828 – April 18, 1896) was an apostle and a member of the First Presidency of the Reorganized Church of Jesus Christ of Latter Day Saints (RLDS Church). Blair was born in Holley, New York. In 1839, his family moved to LaSalle County, Illinois. In 1851, Blair encountered missionaries from the Latter Day Saint movement. On October 8, 1851, Blair was baptized by William Smith, the younger brother of Joseph Smith, the founder of the Latter Day Saint movement. Blair was married to Elizabeth J. Doty and was the father of seven children.